KR100881817B1 - Method for monitoring the operational reliability of rechargeable lithium cells - Google Patents

Method for monitoring the operational reliability of rechargeable lithium cells Download PDF

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KR100881817B1
KR100881817B1 KR1020020005777A KR20020005777A KR100881817B1 KR 100881817 B1 KR100881817 B1 KR 100881817B1 KR 1020020005777 A KR1020020005777 A KR 1020020005777A KR 20020005777 A KR20020005777 A KR 20020005777A KR 100881817 B1 KR100881817 B1 KR 100881817B1
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battery
voltage
limit
specified
temperature
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KR20020064866A (en
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페테르 닥터.비어케
데잔 닥터.일릭
콘라트 닥터.홀
라이너 할트
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미크로바테리에 게엠베하
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16533Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
    • G01R19/16538Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
    • G01R19/16542Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44Methods for charging or discharging
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/374Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] with means for correcting the measurement for temperature or ageing
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/05Accumulators with non-aqueous electrolyte

Abstract

전지 전압 및 전지 온도를 측정함으로서 충전식 리튬전지의 동작 신뢰도를 감시하기 위한 방법에서, 지정 전지 한계 전압(U G )과 지정 주변 한계 온도(T G )를 동시에 넘을 경우, 지정 하한 전압이나 지정 하한 주변 온도에 도달할 때까지, 전지가 방전된다. By measuring the battery voltage and the battery temperature in the process for monitoring the operational reliability of the rechargeable lithium battery, a specified cell limit voltage (U G) and specified ambient limit temperature (T G), if at the same time exceeds the peripheral specified lower limit voltage and the specified lower limit , the battery is discharged until it reaches the temperature.
발명의 방법을 실행하기 위한 회로 장치은 전지에서 지정 상한 전압(U G )을 초과할 때 반응하는 제 1 한계값 스위치와, 지정 주변 온도 한계값(T G )을 넘을 때 응답하는 제 2 한계값 스위치(C)를 가지며, 제 1 한계값 스위치와 제 2 한계값 스위치가 동시에 응답할 때 전지를 부하에 연결하는 논리 회로(E)를 또한 가진다. A second threshold value switch which responds when more than a first threshold value switch, and a specified ambient temperature limit (T G) for the reaction time to exceed the specified upper limit voltage (U G) from circuit jangchieun cell for carrying out the method of the invention has a (C), also has a first limit switch and a logic circuit (E) for connecting the battery to the load when the response at the same time the second limit switch. 이때, 전지 하한 전압이나 하한 주변 온도에 도달할 때 변경되도록 두 한계값 스위치(C, D)가 배치된다. At this time, to change when it reaches the ambient temperature of the battery the lower limit voltage and the lower limit are arranged two limit value switches (C, D).

Description

충전식 리튬전지의 동작 신뢰도 감시 방법{Method for monitoring the operational reliability of rechargeable lithium cells} Operational reliability monitoring method of the rechargeable lithium battery {Method for monitoring the operational reliability of rechargeable lithium cells}

도 1은 발명의 방법을 실행하기 위해 적절한 회로 장치의 개략적인 회로도. Figure 1 is a schematic circuit diagram of a suitable circuit device for carrying out the method of the invention.

도 2는 충전/방전 주기동안 C L 을 충전하고 C EL 을 방전하는 동안 전지 전압의 함수로 전지 정전용량을 나타내는 그래프. Figure 2 is a graph showing the cell capacitance as a function of the battery voltage during charging and discharging the EL C C L during the charge / discharge cycles.

본 발명은 전지 전압 및 전지 온도를 측정하고 감시함으로서 충전식 리튬 전지의 동작 신뢰도를 감시하는 방법에 관한 것이다. The invention relates to a method for monitoring the operational reliability of the rechargeable lithium cells by measuring and monitoring the battery voltage and the battery temperature.

충전식 리튬/이온 전지는 특별한 충전 기술을 필요로하고, 특히, 지정된 스위치-오프 전압이 정확하게 준수되어야 하고, 충전기가 고장날 경우, 보호 회로가 추가적인 충전을 차단하여야 한다. Rechargeable Li / ion batteries require special charging technique, and in particular, the designated switch-off voltage to be followed exactly, to be the protection circuit blocks the additional charge if failure of the charger. 이러한 전지가 방전되고 있을 때, 전지에 회복불가한 손상이 가해지는 것을 방지하기 위하여 특정 전압의 하한선을 넘어서는 안될 것이다. When such a battery is discharged, it should not exceed the lower limit of a specified voltage so as to prevent a damage to be applied is not restored to the battery. 따라서 리튬 이온 전지에 특별한 전자적 보호 스위치가 제공되고, 상기 스위치는 충전 장치가 비정상적으로 동작할 때 지정된 최종 충전 및 방전 전압에서 스위치-오프되며, 상기 스위치는 특별한 보호 장치와 함께, 과도한 전압 수준에 대해 전지를 보호하고 위험한 상황의 발생을 방지하고자 하는 의도를 가진다. Accordingly there is provided a special electronic protection switch to a lithium ion battery, the switch the charging device is switched from the final charge and discharge voltage given when operating abnormally-and-off, the switch with a special protective device, for over-voltage level protect the battery and have the intention to prevent the occurrence of dangerous situations. 위험한 상황의 발생이란 전해질에 비가역적인 분해를 일으킬 수 있고 전지 손상을 일으킬 수 있는 경우이다. The occurrence of a dangerous situation is a case that may cause irreversible degradation in the electrolyte and can lead to cell damage. 이러한 감시 기능을 가진 충전기들은 예를 들어 WO 96/15563 호에 설명되어 있다. Chargers with such monitoring are for example described in WO 96/15563 call.

발명은 충전식 리튬 전지의 동작 신뢰도를 추가적으로 개선시키는 방법을 구체화하는 것을 목적으로 한다. Invention has for its object to embody a method of improving further reliability of the operation of rechargeable lithium batteries.

발명에 따라, 이 목적은 청구범위 제 1 항의 특징을 이용하여 최초에 언급한 방법에 대해 달성된다. According to the invention, this object is achieved for the method mentioned in the first place by the claims, claim 1 features. 종속항들은 이 방법의 세부사항을 추가로 구체화하며, 이 방법을 실행하기에 적절한 회로 장치을 추가로 구체화한다. The dependent claims are also added to refine the details of the method, the embodiment further jangchieul suitable circuitry for carrying out the method.

발명에 따르는 방법은, 전지가 임계 충전 상태나 임계 온도에 더 이상 놓이지 않도록 충분한 정전용량이 여전히 가용할 때까지 전지를 방전시키면서, 고온 및 임계 충전 상태에서의 전기화학적 분해에 대해 리튬 전지를 보호한다. The process according to the invention, while the battery is discharged the battery until the still available longer sufficient capacitance so placed in the critical state of charge and the critical temperature, and protects the lithium battery for the electrochemical decomposition at high temperatures and the critical state of charge .

도 1은 발명의 방법을 실행하기 위해 적절한 회로장치의 개략적인 회로도이고, 도 2는 충전/방전 주기동안 C L 을 충전하고 C EL 을 방전하는 동안 전지 전압의 함수로 전지 정전용량을 나타내는 그래프이다. 1 is a schematic circuit diagram of a suitable circuit device for carrying out the method of the invention, Figure 2 is a graph showing the cell capacitance as a function of the battery voltage during charging and discharging of C EL of C L during charge / discharge cycles . 이는 전류 C/2로 실행된다. This is carried out at a current C / 2.

배터리 전압 U B 는 회로 모듈 A의 보조 전압 U H 를 생성하는 데 사용되고, 이는 전체 회로에서 논리 게이트 및 한계값 스위치의 정확한 동작을 보장하는 데 필요하다. The battery voltage U B is the circuit used to generate the secondary voltage U H of the module A, which is necessary to ensure the correct operation of the logic gate and the threshold value switch in the entire circuit. 안정한 보조 전압 U H 는 최소 배터리 전압보다 상당히 작은 것이 선호된다. Stable auxiliary voltage U H is preferred to significantly smaller than the minimum battery voltage. 여기서 고려되는 리튬 전지의 배터리 전압은 2.7에서 4.2 볼트 사이이고, 따라서 예를 들어, 안정한 보조 전압은 대략 2.5 볼트일 수 있다. Battery voltage of the lithium battery that is considered here is between 4.2 volts at 2.7, and thus may be, for example, a stable auxiliary voltage is approximately 2.5 volts.

온도 센서 B는 주변 온도에 비례하는 전압 신호를 생성하며, 상기 전압 신호는 한계값 스위치 C에 공급된다. Temperature sensor B generates a voltage signal proportional to the ambient temperature, the voltage signal is supplied to the threshold switch C. 지정된 상한 온도 T G 를 넘을 경우, 한계값 스위치 C는 온 상태로 변경된다. If more than the upper limit temperature T G is specified, the threshold switch C is changed to the on state. 이 한계값 스위치는 히스테리시스 방식으로 배치된다. This limit switch is arranged in a hysteresis fashion. 이 스위치는 제한 온도 T G 한참 아래의 새 값 이하로 온도가 떨어질 때만 오프 상태로 다시 변경된다. The switch only when the temperature falls below the new value of the limit temperature T G below far is again changed to the OFF state. 추가적인 한계값 스위치 D는 배터리 전압이 지정 상한값 U G 에 이를 때 온 상태로 변경된다. Additional limit switch D is changed to the on state when this battery voltage is the specified upper limit value U G. 이 한계값 스위치 역시 히스테리시스 방식으로 배열되어, 이전에 얻은 한계 전압 U G 와 차후에 발생하는 전압 사이에 충분한 간격에 이를 때까지 오프 상태로 다시 변경되지 않는다. This limit switch also is arranged in a hysteresis manner, it is not until a sufficient interval between the voltage generated in the future and previous threshold voltage U G obtained in the change to the OFF state again. 두 한계값 스위치 C와 D로부터의 출력 신호는 논리 게이트에 공급되고, 온도와 전압 모두가 지정 한계값에 도달할 때 상기 논리 게이트를 통해 스위치 F를 이용하여 부하 저항 G가 배터리에 연결된다. The output signal from the two limit switches C and D are supplied to a logic gate, using the switch F via the logic gate G is connected to the load resistance when the battery temperature and voltage both reach a specified threshold value. 전지 전압이 한계값 스위치 D의 한계 전압 U G 한참 아래로 떨어지거나 주변 온도가 한계값 스위치 C의 하한 스위칭 값 밑으로 떨어질 때, 상기 방전 과정이 중단된다. When the cell voltage falls to a limit value switch threshold voltage U D G or far below the ambient temperature falls below the lower limit value of the switching threshold value switch C, the discharge process is interrupted. 대략 4볼트의 전압이 상한 전압으로 선택되는 것이 선호된다. A voltage of approximately 4 volts is preferred to be selected as the upper limit voltage. 이는 90%의 전지 충전 상태에 상응하며, 상한 온도 T G 는 약 80℃로 정해진다. This is corresponds to 90% of battery charge, the upper limit temperature T G is determined to be about 80 ℃. 두 한계값들을 모두 넘을 때 발생하는 전지의 방전은 대략 3.82볼트의 전압까지 내려가도록 실행되어야 하고, 다시 말하자면 70%의 충전 상태로 내려가도록 실행되어야 한다. Discharging of the battery that occurs when all of the more than two threshold values ​​are approximate and should be executed so as to go down to a voltage of 3.82 volts, in other words to be executed so as to go down to the 70% charged. 그러나, 전압을 3.9볼트까지만 떨어뜨리고 70℃나 60℃를 온도 하한값으로 선택하는 것도 방전 과정에서 충분할 수 있다. However, dropping the voltage up to 3.9 volts may be sufficient to be discharged from the process of selecting the 70 ℃ or 60 ℃ the temperature lower limit value.

전압 및 온도 하한값은 각 시스템에 대해 명확하게 규정되고 결정되어야 한다. Voltage and the temperature lower limit value should be defined explicitly for each system is determined. 하한 전압값을 결정하기 위해, 하한 전압은 다음과 같이 선택된다. To determine the lower limit voltage value, the lower voltage is selected as follows: 즉, 방전 과정의 말미에, 전압이 다시 상한값 위로 회복하지 않아서 회로가 진동할 수 없도록, 하한 전압이 선택된다. That is, the end of the discharge process, so that the voltage can have did not recover over the upper limit oscillation circuit, a lower voltage is selected.

히스테리시스를 가지는 한계값 스위치를 배치하는 것은 진동 가능성을 방지한다. Placing a limit switch having a hysteresis to prevent oscillation potential. 설명된 개략적 회로의 기능은 충전식 리튬 전지의 동작을 감시하기 위해 사용되는 공지된 IC 회로에 통합될 수 있다. Features of the described schematic circuit can be incorporated in a known IC circuit is used to monitor the operation of the rechargeable lithium battery.

발명에 따른 측정은, 주변 온도와 전지 전압으로 인해 2차 전기화학 반응이 발생하여 내부 저항 및 정전용량 손실을 증가시키는 충전 상태의 결과로 인한, 고온에서 기계적 및 전기화학적 손상에 대해 충전식 리튬 전지, 특히 리튬 폴리머 전지를 보호할 수 있다. Measured according to the invention, due to the ambient temperature and the battery voltage secondary electro-chemical reaction caused by an internal resistance and capacitance as a result of the charge increases the loss, in a high temperature rechargeable lithium batteries for mechanical and electrical chemical damage, In particular, it is possible to protect the lithium polymer battery.

Claims (5)

  1. 전지 전압과 전지 온도를 측정함으로서 충전식 리튬 전지의 동작 신뢰도를 감시하는 방법으로서, 지정 전지 한계 전압(U G )과 지정 주변 한계 온도(T G )를 동시에 넘을 경우, 지정 하한 전압이나 지정 하한 주변 온도에 도달할때까지, 전지가 방전되는 것을 특징으로 하는 방법. A method for monitoring the operational reliability of the rechargeable lithium cells by measuring the battery voltage and the battery temperature, the specified cell limit voltage (U G) and specified ambient limit temperature (T G) at the same time, specifies the lower limit voltage and the specified lower limit ambient temperature, if more than on until, characterized in that the battery is dead.
  2. 제 1 항에 있어서, 한계 전압(U G )이 4.0 볼트이고, 한계 온도(T G )가 80℃인 것을 특징으로 하는 방법. The method of claim 1, wherein the limit voltage (U G) is 4.0 volts, threshold temperature characterized in that (T G) is a 80 ℃.
  3. 제 1 항 또는 2 항에 있어서, 하한 전압이 3.9볼트보다 작고, 하한 주변 온도 한계가 70℃인 것을 특징으로 하는 방법. According to claim 1 or 2, characterized in that the lower limit voltage is less than 3.9 volts, the lower ambient temperature limit is 70 ℃.
  4. 제 1 항 또는 2 항에 있어서, 하한 전압이 3.82 볼트이고, 하한 온도가 60℃인 것을 특징으로 하는 방법. According to claim 1 or 2, characterized in that a lower limit voltage is 3.82 volts, which is the lower limit temperature 60 ℃.
  5. 제 1 항 또는 2 항에 따른 방법을 수행하는 회로 장치에 있어서, The circuit according to the apparatus for performing the method according to claim 1 or 2,
    상기 회로 장치은 전지에서 지정 상한 전압(U G )을 넘을 때 반응하는 제 1 한계값 스위치(D)와, 지정 주변 온도 한계(T G )를 넘을 때 반응하는 제 2 한계값 스위치(C)를 가지며, 제 1 한계값 스위치와 제 2 한계값 스위치가 동시에 응답할 때 전지를 부하에 연결하는 논리 회로(E)를 또한 가지며, 이때, 전지 하한 전압이나 하한 주변 온도에 도달할 때 변경되도록 두 한계값 스위치(C, D)가 장치되는 것을 특징으로 하는 회로 장치. Having a second threshold value switch (C) to react when more than a first threshold value switch (D) and a specified ambient temperature limit (T G) for the reaction time exceeds the specified upper limit voltage (U G) from jangchieun battery the circuit a first threshold value switch and the second limit switch has at the same time also a logic circuit (E) for connecting the battery to the load when responding, at this time, the battery the lower limit voltage and the two thresholds to be changed to reach the lower limit of the ambient temperature switch (C, D) is a circuit device which is characterized in that device.
KR1020020005777A 2001-02-03 2002-02-01 Method for monitoring the operational reliability of rechargeable lithium cells KR100881817B1 (en)

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DE10104981A DE10104981A1 (en) 2001-02-03 2001-02-03 Procedure for monitoring the operational safety of rechargeable Li cells
DE10104981.1 2001-02-03

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KR100881817B1 true KR100881817B1 (en) 2009-02-03

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US6570364B2 (en) 2003-05-27
US20020105304A1 (en) 2002-08-08
KR20020064866A (en) 2002-08-10
EP1229339A2 (en) 2002-08-07
JP2002289264A (en) 2002-10-04
DE10104981A1 (en) 2002-08-08
CN1379499A (en) 2002-11-13
EP1229339A3 (en) 2003-06-18
EP1229339B1 (en) 2010-12-01
AT490473T (en) 2010-12-15
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DE50214793D1 (en) 2011-01-13
CN1221056C (en) 2005-09-28

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